High Power Chassis Mount Dc-Dc Converters



Introduction

Welcome to CUI's Product Spotlight on high power chassis mount dc-dc converters. Learn about product features, applications and protections, as well as CUI's available product line of high power chassis mount dc-dc converters.

Objectives

  • Explain the growing need for 4:1 input ranges in dc-dc converters
  • Summarize the range of products in CUI's high power chassis mount series
  • Describe the series' key features

Chassis Mount Dc-Dc Converters


The VHK and VFK series from CUI are a line of rugged chassis mount dc-dc converters ranging in output power from 50 watts to 600 watts. Featuring an integrated heat sink for improved thermal performance, the units are able to operate at higher temperatures with a minimal amount of air flow. The series' chassis mount packaging allows users to install the units in applications where a dedicated circuit board for the power system may not be feasible.

The Need for Wider Input Ranges


In many applications, the system's input voltage can be unstable or vary over a wide range. Often times, the 2:1 input range seen in many industry standard isolated dc-dc converters is not wide enough to address a fluctuating line voltage. The VHK series and VFK400W series offer an ultra-wide 4:1 input range, making them ideal for applications where the dc voltage rail is variable such as battery-fed equipment. As the battery loses its charge, the voltage will drop accordingly. To continue to feed a stable output voltage to the load, the dc-dc converter's input range must be able to accommodate the voltage drop during discharging conditions and voltage rise during recharging conditions.

Features

The output voltages of the VHK and VFK families are preset to nominal values as indicated by the model table in the previous slide. If desired, the output voltage may be trimmed to + or - 10% with an external potentiometer.

Logic Positive Negative
SW Closed (VREM < 0.8V) Output Off Output On
SW Open (VREM > 2.4V) Output On Output Off

Remote On/Off Control

The series' output can be enabled or disabled through the REM (on/off) pin. Standard models default to positive logic although negative logic versions are also available from CUI.

Remote Sense

The VHK and VFK series provide regulated outputs at the output terminals. When there is a large current and/or the output cable is of some length, the voltage at the end of the output cable may be noticeably lower than at the terminals. The converter can compensate up to 0.5 V of voltage drop through remote sense terminals. To ensure accurate regulation, users should run two separate wires (twisted) from the desired regulation points to the remote sense terminals. Even if the load current is low, users should still connect +Vo to +S and -Vo to -S.

Protections

  • Over current protection
  • Short circuit protection
  • Over voltage protection
  • Over temperature protection

The VHK and VFK series come with built-in over current, short circuit, over voltage, and over temperature protections. In the event of a fault in any of these areas, the converter's output will shut down, recovering automatically when the fault is removed.

Installations


The VHK and VFK series' chassis mount packaging allow users to install the units in applications where a dedicated circuit board for the power system is not feasible or is cost prohibitive. Users are able to secure the VHK or VFK series to a chassis and connect the input and output cables via the module's terminal block connectors.

Applications

The VHK and VFK series' rugged packaging and high power output make them ideal for a wide range of applications, including transportation, communications and industrial equipment.

Transportation

Forklift, bus/automotive, marine

Communications

Base stations, mesh networks

Industrial

Oil drilling, construction, automation equipment

Available Products


CUI's high power chassis mount family is available in 7 separate series from 50 watts up to 600 watts. Output voltages range from 3.3 Vdc up to 48 Vdc.

Part Number Power (W) Input Voltage (Vdc) Output Voltages (Vdc) Size (in)
VHK50W 50 9~36, 18~75 3.3, 5, 12, 15, 24, 28, 48 4.25 x 4.0 x 1.5
VHK75W 75 9~36, 18~75 3.3, 5, 12, 15, 24, 28, 48 4.25 x 4.0 x 1.5
VHK100W 100 9~36, 18~75 3.3, 5, 12, 15, 24, 28, 48 4.25 x 4.0 x 1.5
VHK150W 150 9~36, 18~75 12, 15, 24, 48 4.25 x 4.0 x 1.5
VHK200W 200 10~36, 18~75 12, 15, 24, 28, 48 4.25 x 4.0 x 1.5
VFK400W 400 10~36, 18~75 12, 24, 48 7.84 x 4.99 x 1.54
VFK600 600 10~36, 18~75 12, 24, 28, 32, 48 7.84 x 4.99 x 1.54

Summary

CUI's VHK and VFK series offers rugged, high power dc-dc converters from 50 watts up to 600 watts. This provides a top of the line solution for applications that require a wide input range and the convenience of chassis mounting. For more information, please visit our website.


North America/Global

sales@cui.com

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